\documentclass{llncs}

\usepackage{color}
\usepackage{booktabs}
\usepackage{algorithm}
\usepackage{algorithmic}
\usepackage{graphicx}
\usepackage{xspace}
\usepackage{balance}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{mathtools}
\usepackage{url}
\usepackage[caption=false,font=footnotesize]{subfig}

\def\TODO#1{\textcolor{red}{{\bf [TODO:}~#1{\bf ]}}}
\def\NOTE#1{\textcolor{blue}{{\bf [NOTE:}~#1{\bf ]}}}
\def\CHK#1 {\textcolor{magenta}{{\bf [CHK:}~#1{\bf ]}}}
\def\Vec#1{{\boldsymbol{#1}}}
\def\Mat#1{{\boldsymbol{#1}}}

\newcommand{\ie}{{i.e.,}\@\xspace}
\newcommand{\eg}{{e.g.,}\@\xspace}
\newcommand{\etal}{{\it et~al.}\@\xspace}

% For algorithms
\renewcommand{\algorithmicrequire}{\textbf{Input:}}
\renewcommand{\algorithmicensure}{\textbf{Output:}}

\DeclareMathOperator*{\argmin}{\arg \min}
\DeclareMathOperator*{\argmax}{\arg \max}
\DeclarePairedDelimiter{\floor}{\left\lfloor}{\right\rfloor}

\graphicspath{{./figs/}}

\title{
Title
}
\begin{document}

\maketitle
% %
% \titlerunning{Hamiltonian Mechanics}  % abbreviated title (for running head)
% %                                     also used for the TOC unless
% %                                     \toctitle is used
% %
% \author{Ivar Ekeland\inst{1} \and Roger Temam\inst{2}
% Jeffrey Dean \and David Grove \and Craig Chambers \and Kim~B.~Bruce \and
% Elsa Bertino}
% %
% \authorrunning{Ivar Ekeland et al.} % abbreviated author list (for running head)
% %
% %%%% list of authors for the TOC (use if author list has to be modified)
% \tocauthor{Ivar Ekeland, Roger Temam, Jeffrey Dean, David Grove,
% Craig Chambers, Kim B. Bruce, and Elisa Bertino}
% %
% \institute{Princeton University, Princeton NJ 08544, USA,\\
% \email{I.Ekeland@princeton.edu},\\ WWW home page:
% \texttt{http://users/\homedir iekeland/web/welcome.html}
% \and
% Universit\'{e} de Paris-Sud,
% Laboratoire d'Analyse Num\'{e}rique, B\^{a}timent 425,\\
% F-91405 Orsay Cedex, France}


\input{sec_abstract}
\input{sec_introduction}
\input{sec_background}


\bibliographystyle{abbrv}
\bibliography{reference}
\end{document}